Hercules came to Comic-Con.
Dwayne Johnson made an unannounced appearance Thursday inside the San Diego Convention Center's largest exhibition hall.
He slapped high-fives with fans and announced a free, advanced screening of his latest movie, "Hercules."
Johnson, who plays the title character in the film, said he booked three San Diego theaters for the special screening and invited everyone in the exhibition hall.
"Hercules" opens Friday.